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提出了一种可同时考虑结构几何非线性效应曲面气动力效应的大变形飞机静气动弹性配平和载荷分析方法.该方法利用三维曲面涡格法计算大变形飞机的曲面气动力,引入非线性结构有元计算方法考虑结构几何非线性效应,采用曲面样条插值方法解决气动/结构耦合问题,然后结合全机在变形构型下的刚体运动平衡方程进行柔性飞机大变形状态气动/结构耦合情况下的静气动弹性配平迭代求解.以某常规局大展弦比柔性飞机半展长缩比模型为例,应用该方法对其纵向静气动弹性配平特性及飞行荷进行详细的分析与研究,并与MSC Flightloads线性方法的计算结果进行了对比.分析结果表明结构变形较小时,本文非线性方法和线性方法的计算结果吻合较好.而当结构具有较大变形时,由于线性方法无法考虑气动力曲面效应和结构几何非线性效应故不再适用,而本文出的非线性方法可对大柔性飞机在大变形构型下的配平特性作出较为准确合理的预测,并可满足飞机设计各个阶段的工程应用需求,完成考虑结构几何非线性静气动弹性配平特性的多轮次快速分析.
This paper proposes a static aerodynamic elastic leveling and load analysis method for a large deformation aircraft that can simultaneously consider the aerodynamic effects of geometric non-linear effect surface.The method uses the three-dimensional curved surface vortex method to calculate the surface aerodynamic force of a large deformation aircraft, introduces a nonlinear structure The meta-calculation method considers the geometrical non-linearity effect of the structure and the surface spline interpolation method to solve the aerodynamic / structural coupling problem. Then, in combination with the rigid body motion balance equation of the whole machine in the deformed configuration, The static half-span ratio model of a conventional large-aspect ratio flexible aircraft is taken as an example to analyze and analyze the longitudinal static-dynamic elastic leveling characteristics and the flight load in detail. MSC Flightloads linear method is compared with the results of the analysis.The results show that when the deformation of the structure is small, the calculated results of the nonlinear method and the linear method agree well with each other.When the structure has large deformation, the linear method can not consider the aerodynamic surface Effect and structure of geometric nonlinear effects are no longer applicable, but this article out of non-linear Law can make a more accurate and reasonable prediction of the trim characteristics of a large flexible aircraft under large deformation configurations and can meet the engineering application requirements of all stages of aircraft design and complete the multiple rounds of rapid response considering the geometric nonlinear static- analysis.